7 1/2 foot monofilament leader tapered to 3X ( you'd attach 2' or so of level tippet to the end of this from the tippet spools that Softouch suggested with a double Surgeon's knot.)

A fly floatant for dry flies like the Adams- Something like DAB, which is an inexpensive paste type thing in an orange plastic container that hangs from your vest. You dip your finger in get a bit on and and smush it into the fly's body and hackle. It'll help keep them afloat when you're fishing for bluegills and trout.

A couple more flies that would be good for smallmouth to add to your box:

a couple clousers (they have a bit of weight usually lead or brass eyes that cause the hook to flip and ride point up so). Chartruese and brown over orange (for crayfish) would be good choices.

Something that suspends a bit for fishing shallower than the bugger or clouser- I'd go with a black marabou muddler size 6 or so. It pushes a lot of water, has a lot of movement, and it's a good fly to fish around snags and undercut backs by dropping back in the current. It's also a good fly for large trout as well as smallmouth.

As it gets warmer and moves into summer, fishing some top water stuff for smallmouth can be a blast- grasshopper patterns, gurglers or crazy looking stuff with rubber legs like a Madam X twitched along the surface can be fun to fish on summer evenings. You might want to add something like that down the road.